Looks like I found a post almost identical to my question, sorry, I know..search!!

Okay I guess I keep searching!!
**EDIT **
Okay so I am thinking about getting a 150r..mostly as a play bike as I already ride a 450X. BEfore I do it, a really need some input!
1. I am pretty big, at 203lbs, so, is the 150r out of the question, can I upgrade it to make is "fun"
2. This is going to be a fun trail bike (yes I know its a R) and possible something to just take to the track. I am a trail rider, so I do not race, but would not mind trying it on a small bike.
3. Can it be "upgraded", i.e. shocks, etc.
4. Would I just be better off geting a different bike?
Thanks for any/all input, I lik the 150r for a few reasons, it looks fun, its small and easy, and the price is right, though close to a used 250r/x. My main concern is by "butt"

Again thanks!
-SnE